随机评估可以帮助我们了解发展中哪些措施有效，哪些无效。

To lose one parent may be regarded as a misfortune; to lose both looks like carelessness.

企业的角色是生产能够改善人们生活的产品和服务，同时使用更少的资源，并且要合法行事、保持诚信。

我们必须始终质疑我们的假设，并愿意根据新的证据修订我们的理论。

You can't be wise and in love at the same time.

I have made all the calculations; fate will do the rest.